6Instruction Manual
SECTION 3 - INSTALLATION
3.6 GENERAL INFORMATION
Use piping materials that are resistant to corrosion
by the liquid being pumped. Use care in selection
of materials to avoid galvanic corrosion at points
of connection to the pump liquid end.
Use piping sufciently heavy to withstand maximum
pressures.
Blow out all lines before making nal connections
too pump.
Provide for pipe expansions when hot uids are
to be pumped. Support piping so that pipe weight
is not placed on the pump. Never spring piping to
make connections.
Piping should be sloped in a manner to prevent
tapping of vapor pockets. Vapor present in liquid
end will cause inaccurate pump delivery.
3.7 SUCTION PIPING
If possible use metal or plastic tubing for the suction
line because tubing has a smooth inner surface and
can be formed into sweep bends, thus decreasing
frictional flow losses. Suction piping must be
absolutely air tight to insure accurate pumping.
After installation, test suction piping with air and
soap solution for leaks.
A strainer should be used in the suction line to
prevent foreign particles from entering the liquid
end. Any measures which prevent foreign matter
from entering and fouling the ball checks will give
increased maintenance free service.
It is preferable to have the suction of the pump
ooding by having the liquid end located below the
level of the uid in the supply tank.
When pumping liquids at temperatures near the
boiling point, provide sufcient suction head to
prevent “ashing” of the liquid into vapor when it
enters the liquid end on the suction stroke.
If suction piping is long, particularly at stroke
speeds greater than 70 strokes per minute, the
suction piping should always be larger than tting
size to prevent starving the pump.
Sealed piping, sufcient suction pressure, and
properly adjusted packing are absolutely necessary
for accurate and stable pump operation.
3.8 DISCHARGE PIPING
Install adequate size piping to prevent excessive
pressure losses on the discharge stroke of the
pump. Maximum pressure at the discharge tting
on the liquid end must be kept at or below the
maximum pressure rating as shown on the pump
data plate. The peak ow of this type of pump
during the discharge stroke is approximately three
times the average ow rate (because of harmonic
motion of the plunger) and discharge piping should
be sized accordingly.
The pump will not deliver a controlled flow if
the discharge pressure is less than the suction
pressure. Piping should be arranged to provide at
least 5 psi (34.5 kPa) positive pressure differential
from the discharge side to the suction side.
There are a number of ways to create an articial
discharge pressure, such as the use of a vented
riser or a back pressure valve.
3.9 PIPING CONCENTRATED
SULFURIC ACID
The liquid ends of pumps with plungers less than
5/8” in diameter, designed for 20 gph delivery
or less, are too small to tolerate the sludge in
commercial concentrated sulfuric acid. However,
even these pumps will serve in such applications
if the piping system is modied as follows:
1. Install a sulfuric acid tank, which has an
unused portion below the tank outlet to the
suction line to collect sludge from the system.
(Maximum pressure / sludge trap is 20 psig.)
2. Ensure pump suction is ooded.
3. Use piping material identical to liquid end
material: install steel pipe to steel liquid
end. Never connect iron to steel or serious
galvanic corrosion will occur.
